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Osprey Kestrel 48 vs Six Moon Designs Swift X

Weight and specs compared for 2026 — and which one to choose.

Six Moon Designs Swift X is the lighter option — 735 g lighter than the Osprey Kestrel 48 (49% less weight). If grams matter to you, that is the one to beat.
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Spec Osprey Kestrel 48 Six Moon Designs Swift X
Weight 1,500 g · 1.500 kg · 3.31 lb 765 g · 0.765 kg · 1.69 lb
Brand Osprey Six Moon Designs
Category Backpack Backpack
Osprey Kestrel 48
1,500 g

Adjustable 48L pack with AirScape back panel.

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Six Moon Designs Swift X
765 g

Highly configurable 50L ultralight pack with removable stay, hip belt and vest harness options to dial in fit and weight.

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Osprey Kestrel 48 vs Six Moon Designs Swift X: which should you buy?

If saving weight is your priority, the Six Moon Designs Swift X wins — at 765 g it is 735 g (49%) lighter than the Osprey Kestrel 48 (1,500 g). That said, the heavier option may justify the extra grams with more capacity, durability or comfort, so weigh the trade-off against how you'll use it.

See where both rank against everything else in this category on the lightest backpack page, or browse the full gear weight database.

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